Limp inverted mantle.



Patented Ma1t30,1915.

INVENTOR WITNESSES THE NORRIS PETERS 60., PHOTO-LITHO.. WASHINGTON. o

n rs srarns Parana OFFICE.

SVERRE GULBRANDSEN, OF VOOIDBURY, NEW JERSEY, ASSIGNOR TO WELSBACH LIGHT COMPANY, OF GLOUCESTER CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

LIMP INVERTED MANTLE.

Specification of Letters Patent.

Patented Mar. 30, 1915.

Application filed May 6, 1914. Serial No. 836,670.

To all whom it may concern: 7

Be it known that I, SVERRE GULBRANDSEN, a citizen of the United States, residing at Woodbury, in the county of Gloucester and State of N'ew Jersey, have invented a new and useful Improvement in Limp Inverted Mantles, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a sectional side elevation showing one of my improved mantles in place ready to light, and Fig. 2 is a similar view showing the mantle after burning and hardening in burning position.

Heretofore, in the manufacture of inverted mantles, for use on ordinary city pressures, as distinguished from pressure systems, the mantles have been burned, hardened and shaped at the factory. This operation involves considerable expense and labor and also requires the application of a protective coating and special packing boXes for shipping.

Inverted mantles, as now made, are tied or secured to a refractory ring which in turn is secured to the burner tip, the ring being larger than the burner tip so that there is an annular opening left between these two parts for the escape of products of combustion. I have discovered incandescent mantles of the usual sizes may be sold in limp condition and hardened in place on the inverted burners, provided the mouth of the mantle is temporarily closed during the burning period. By temporarily closing or throttling down the ordinary annular outlet for the gases around the tip, I find that gas, under ordinary city pressures will act to properly harden and shape the mantle while in burning position.

My invention, therefore, consists in providing a mantle with a temporary closure or battle which will throttle or shut oif the flow of the products through the open end dur ing the first burning period and will gradually be destroyed by the heat so that after the mantle is hardened and shaped the proper lighting effect is produced thereby.

In carrying out my invention, I add to the ordinary inverted mantle a temporary closure preferably of parchment paper or sheet cellulose which co-acts with the ring to fit around the burner tip and throttle down, preventing exit of products through this end until the mantle has been shaped and hardened.

In the drawings, 2 represents an inverted mantle in limp or rag condition with its open end tied in the usual manner to the magnesla rlng 3. This ring has the usual legs a by which it is hung on projections from the burner tip 5. As shown, the ring 3 is of considerably greater diameter than the burner tip and to temporarily close the annular space between it and the burner tip, the perforated disk 6 is used, this being of such material that it will be destroyed under the continued heat of the Bunsen burner. This closure may be secured to the mantle rlng in any desirable way, as, for example, by cementing it to the under side of the magnesia ring, as shown in the drawing. The temporary closure may be secured to the ring or mantle as sold, in any desired manner, and simply serves to close the annular space between the refractory ring of the mantle and the burner tip during the time that the limp mantle is being hardened and shaped. It is then destroyed by the heat of the burner and the exit for parts of the products of combustion is afi'orded as in the usual form.

The advantages of my invention will be obvious to those skilled in the art, since mantles of ordinary sizes above five'eighths to seven-eighths of an inch in diameter when shaped can be sold in limp condition and hardened and shaped under ordinary city gas pressures. l/Vith such mantles above seven-eighths of an inch diameter when shaped, the outlet between the burner top and the mantle supporting the ring is essential to give the proper incandescence to the mantle and I obtain this outlet by the destruction of the temporary closure after the shaping operation has taken place.

The mantles may be compactly shipped in limp condition, doing away with the need for special packages for each individual mantle and the expense and delay incident to shaping and hardening in the factory are done away with.

Changes may be made in the form and arrangement of the temporary closure within the scope of the appended claims, as this closure may be formed in any desired manand burning.

The material of the closure may be varied and other changes may be made without departing from my invention;

I claim:

1; An inverted limp mantle having a temporary closure at its open end adapted to be destroyed by heat; substantially as described.

2. The combination of an inverted mantle secured to a support, of a burner tip, and a temporary closure for the mouth of the mantle surrounding the burner tip; substantially as described.

3. A limp inverted mantle having a temporary closure secured to the refractory mantle ring; substantially as described;

4. A limp inverted mantle having a perforated closure at its open end adapted to be destroyed by the heat of the burner; substantially as described. I

In testimony whereof, I have hereunto set my hand.

SVERRE 'GULBRANDSEN.

Witnesses:

Tnos. K. LANCASTER, J. H. JOHNSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). C. 

